BASE STATION DEVICE AND PACKET TRANSMISSION POWER CONTROL METHOD

摘要

A transmission destination decision section (301) selects a communication terminal device as a candidate to which a packet is transmitted from a packet transmission control signal and decides a transmission destination device according to a CQI signal from the selected communication terminal device. A packet quality estimation section (303) estimates the reception packet quality in the transmission destination device according to the CQI signal and calculates the requested packet quality for achieving the target packet quality during re-transmission according to the estimation result. Upon reception of an ACK signal from the transmission destination device, a transmission power decision section (304) sets the transmission power to a predetermined power. Upon reception of a NACK signal, the transmission power decision section (304) decides the transmission power so as to satisfy the requested packet quality. Thus, without transmitting packet quality information from the communication terminal device, the base station device can estimate the packet reception quality in the communication terminal device and decide the transmission power required for re-transmission according to the packet reception quality.